#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX 41


int main() {
    FILE *fp;
    char words[MAX];

    if ((fp = fopen("wordy", "a+")) == NULL) {
        fprintf(stdout, "Can't open \"wordy\"file.\n");
        exit(EXIT_FAILURE);
    }

    puts("Enter words to add to the file; press the #");
    puts("Key at the beginning of a line to terminate.");
    while ((fscanf(stdin, "%40s", words) == 1) && (words[0] != '#'))
        fprintf(fp, "%s\n", words);

    puts("File contents:");
    rewind(fp); //返回到文件开始处
    while (fscanf(fp, "%s", words) == 1)
        puts(words);
    puts("Done!");
    if (fclose(fp != 0))
        fprintf(stderr, "Error closing file\n");

        return 0;
}
